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| Patents for De Witt C. Laurence | |||||
| Number | Date | Patentee | Title | Type | |
| 779 | Jun. 12, 1838 | R. Luscombe | Machine for planing boards | wood planers | |
| 9,072 | Jun. 29, 1852 | G. Hotchkiss | Hanging steps of mill-spindles | ||